I have a 78 series 2 spider.I have fitted a new mechanical fuel pump, from Beta Boys, and had the car running.However now the pump will not pump fuel.I have primed all the lines using a vac pump, and removed the pump checking it manually and it is pumping.I noticed there is no spacer fitted between the pump and the motor, could this be the issue? When I fitted the pump I cannot recall a spacer but may have dropped out during my fault diagnosis at some point and been misplaced.Any help appreciated